/* 
  Najah Schools Hub - Modern Design System 
  Focus: Performance, Responsiveness, Accessibility
*/

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700&family=Inter:wght@400;500;600;700&display=swap');

:root {
    /* Color Palette - HSL for flexibility */
    --primary-h: 152;
    --primary-s: 65%;
    --primary-l: 32%;
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-dark: hsl(var(--primary-h), var(--primary-s), 22%);
    --primary-light: hsl(var(--primary-h), var(--primary-s), 90%);

    --secondary-h: 38;
    --secondary-s: 92%;
    --secondary-l: 55%;
    --secondary: hsl(var(--secondary-h), var(--secondary-s), var(--secondary-l));
    --secondary-dark: hsl(var(--secondary-h), var(--secondary-s), 45%);
    --secondary-light: hsl(var(--secondary-h), var(--secondary-s), 95%);

    --background: hsl(60, 20%, 98%);
    --foreground: hsl(150, 30%, 15%);
    --muted: hsl(150, 15%, 95%);
    --muted-foreground: hsl(150, 10%, 40%);

    --border: hsl(150, 20%, 88%);
    --white: hsl(0, 0%, 100%);
    --black: hsl(0, 0%, 0%);

    /* Fluid Typography - clamp(min, preferred, max) */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;

    --step--2: clamp(0.78rem, calc(0.77rem + 0.03vw), 0.80rem);
    --step--1: clamp(0.94rem, calc(0.92rem + 0.11vw), 1.00rem);
    --step-0: clamp(1.13rem, calc(1.08rem + 0.22vw), 1.25rem);
    --step-1: clamp(1.35rem, calc(1.27rem + 0.39vw), 1.56rem);
    --step-2: clamp(1.62rem, calc(1.50rem + 0.62vw), 1.95rem);
    --step-3: clamp(1.94rem, calc(1.77rem + 0.92vw), 2.44rem);
    --step-4: clamp(2.33rem, calc(2.08rem + 1.34vw), 3.05rem);
    --step-5: clamp(2.80rem, calc(2.45rem + 1.89vw), 3.82rem);

    /* Spacing System */
    --space-2xs: clamp(0.25rem, calc(0.23rem + 0.11vw), 0.31rem);
    --space-xs: clamp(0.50rem, calc(0.46rem + 0.22vw), 0.63rem);
    --space-s: clamp(0.75rem, calc(0.68rem + 0.33vw), 0.94rem);
    --space-m: clamp(1.13rem, calc(1.03rem + 0.49vw), 1.41rem);
    --space-l: clamp(1.69rem, calc(1.53rem + 0.73vw), 2.11rem);
    --space-xl: clamp(2.53rem, calc(2.30rem + 1.10vw), 3.16rem);
    --space-2xl: clamp(3.80rem, calc(3.45rem + 1.65vw), 4.75rem);

    /* Others */
    --radius-s: 0.5rem;
    --radius-m: 0.75rem;
    --radius-l: 1.5rem;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

ul,
ol {
    list-style: none;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--step-0);
    line-height: 1.6;
    color: var(--foreground);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Styles */
h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    color: var(--primary);
    line-height: 1.1;
    font-weight: 700;
    overflow-wrap: break-word;
    word-break: break-word;
    /* Fix for long words in titles */
}

h1 {
    font-size: var(--step-5);
}

h2 {
    font-size: var(--step-4);
}

h3 {
    font-size: var(--step-3);
}

h4 {
    font-size: var(--step-2);
}

p {
    max-width: 65ch;
}

/* Optimal reading width */

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    font-style: italic;
    background-repeat: no-repeat;
    background-size: cover;
}

/* Layout System */
.container {
    width: min(calc(100% - var(--space-l)), 1280px);
    margin-inline: auto;
}

.section {
    padding-block: var(--space-2xl);
}

.grid {
    display: grid;
    gap: var(--space-l);
}

.flex {
    display: flex;
    gap: var(--space-s);
    flex-wrap: wrap;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-s) var(--space-l);
    border-radius: var(--radius-full);
    font-weight: 600;
    min-height: 48px;
    /* Touch target */
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition-base);
    text-wrap: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    color: var(--white);
    box-shadow: 0 4px 15px -3px hsla(var(--secondary-h), var(--secondary-s), var(--secondary-l), 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px hsla(var(--secondary-h), var(--secondary-s), var(--secondary-l), 0.5);
}

.btn-outline {
    background: transparent;
    border-color: var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary);
}

.card {
    background: var(--white);
    padding: var(--space-l);
    border-radius: var(--radius-m);
    border: 1px solid var(--border);
    transition: var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2xs) var(--space-s);
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: var(--step--1);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Header & Nav */
.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: hsla(0, 0%, 100%, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.top-bar {
    background: var(--primary-dark);
    color: var(--white);
    padding-block: var(--space-xs);
    font-size: var(--step--1);
}

.nav-desktop {
    display: none;
    list-style: none;
}

.nav-desktop li {
    display: block;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--space-s);
}

.logo-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.nav-link {
    font-weight: 600;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary);
    transition: var(--transition-base);
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* Mobile Menu */
.menu-toggle {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-nav {
    position: fixed;
    inset: 0;
    background: var(--white);
    z-index: 3000;
    padding: var(--space-2xl) var(--space-l);
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    transform: translateX(100%);
    transition: transform var(--transition-base), visibility var(--transition-base);
    visibility: hidden;
    overflow-y: auto;
}

.mobile-nav.is-open {
    transform: translateX(0);
    visibility: visible;
}

.mobile-nav .flex-col {
    display: flex;
    flex-direction: column;
    gap: var(--space-l);
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-nav .nav-link {
    font-size: var(--step-1);
}

.mobile-nav .btn {
    width: 100%;
    max-width: none;
    /* Allow full width on mobile for better target area but constrained by padding */
}

@media (min-width: 1024px) {
    .mobile-nav {
        display: none !important;
    }
}

/* Sections */
.hero {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('assets/hero-facebook.jpg');
    background-size: cover;
    background-position: center;
    color: var(--white);
    text-align: center;
    padding-top: 80px;
    /* Offset for sticky header */
}

.hero-content {
    max-width: 800px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-m);
}

.hero h1 {
    color: var(--white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-l);
    width: 100%;
    margin-top: var(--space-xl);
}

/* Footer */
.main-footer {
    background: var(--primary-dark);
    color: var(--white);
    padding-block: var(--space-2xl) var(--space-l);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
}

.footer-bottom {
    margin-top: var(--space-2xl);
    padding-top: var(--space-l);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: var(--step--1);
    opacity: 0.8;
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

:focus-visible {
    outline: 3px solid var(--secondary);
    outline-offset: 4px;
}

/* Breakpoints */
@media (min-width: 480px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .nav-desktop {
        display: flex;
        align-items: center;
        gap: var(--space-l);
    }

    .nav-desktop .btn {
        width: auto;
    }

    .menu-toggle {
        display: none;
    }

    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }

    .hero {
        text-align: left;
    }

    .hero-content {
        align-items: flex-start;
        margin-inline: 0;
    }
}

@media (min-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }

    .hero {
        background-attachment: fixed;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    opacity: 0;
}

.animate-fade-in.is-visible {
    animation: fadeIn 0.8s ease forwards;
}

/* Utilities */
.text-gradient {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.mt-xl {
    margin-top: var(--space-xl);
}

.mb-l {
    margin-bottom: var(--space-l);
}

.text-center {
    text-align: center;
}